Urine leaves the renal pelvis and enters the ureter because of
A) contractions of the muscular layers of the renal capsule, which squeeze the kidney.
B) opening of valves into the entrance of the ureters, which permits urine to flow through them passively.
C) peristalsis of the ureters.
D) gravity.
E) All of the answers are correct.
C) peristalsis of the ureters.
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